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Originally Posted by nellotare
I have read that the tach "tells" the compressor that there are "revolutions" from the engine. If the tach fails, the compressor thinks the car has been turned off and therefore will not engage. A safety feature so you don't burn out compressor. I don't have this on my vehicle, but have read posts that indicate this scenario. Hope this helps a little.
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He is right, You have a system in your car that compares the speed of the engine to the speed of the AC compressor. If they are off by a certain percentage (I think 20%) the system than assumes that your compressor is jammed and immediately turns it off. The most likely cause of your problem is the engine speed sensor, or its related wiring. This sensor is also the one that feeds your tachometer its signal.
By the way, are you sure that you don't have a KILMA relay? Its typically located in-front of the firewall behind the Battery. Its usually the Relay that does the speed comparison and turns the AC compressor off if necessary.
You can perform a small experiment (will need two people). Turn the AC off and start the car. Look at the AC compressor while someone activates the AC system from inside the car. I bet that you will notice that it engages for a split second and than shuts off. It will repeat this action once you stop the engine and start it again. It will not come on again unless you turn the engine off.
If the above does happen, than my diagnosis is most likely correct.
Phil